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II Design Procedure Form: Extended Detention Basin (EDB) - Sedimentation Facility II <br />Sheet 1 of 3 <br />Designer: Matthew Young <br />Company: Applegate Group, Inc. <br />Date: January 22, 2008 <br />Project: Parkdale Sand and Gravel Pit - Basin-E Minimum Sediment Pond Size <br />Location: Fremont County, Colorado <br />1. Basin Storage Volume <br /> le = 5.00 % <br />A) Tributary Area's Imperviousness Ratio (i = IB / 100) i = 0.05 <br />B) Contributing Watershed Area (Area) Area = 21.800 acres <br />C) Water Quality Capture Volume (WQCV) WQCV = 0.04 watershed inches <br />(WQCV =1.0 * (0.91 *13-1.19*12+0.78*M <br />D) Design Volume: Vol = (WQCV / 12) * Area * 1.2 Vol = 0.0788 acre-feet <br />2. Outlet Works <br />A) Outlet Type (Check One) Orifice Plate <br /> Perforated Riser Pipe <br /> X Other: Pump <br />B) Depth at Outlet Above Lowest Perforation (H) H = feet <br />C) Recommended Maximum Outlet Area per Row, (A.) Ao = square inches <br />D) Perforation Dimensions: <br />i) Circular Perforation Diameter or D = inches <br />ii) Width of 2" High Rectangular Perforations W = inches <br />E) Number of Columns (nc, See Table 6a-1 For Maximum) nc = number <br />F) Actual Design Outlet Area per Row (A.) Ao = square inches <br />G) Number of Rows (nr) nr = number <br />H) Total Outlet Area (Aat) Aot = square inches <br />3. Trash Rack <br />A) Needed Open Area: At = 0.5 * (Figure 7 Value) * Aot At = square inches <br />B) Type of Outlet Opening (Check One) < 2" Diameter Round <br /> 2" High Rectanaular <br /> Other: <br />Round Opening (Ref.: Figure 6a): <br />or Smaller <br />C) For 2" <br />, <br />, <br />i) Width of Trash Rack and Concrete Opening (Wcone) <br />from Table 6a-1 Wconc = inches <br />ii) Height of Trash Rack Screen (HTR) HTR = inches <br />Quarry - Basin E Sediment Pond.xls, EDB 1/22/2008, 8:48 AM